There is a small live band that plays at the bar in the Grand Floridian. It overlooks the main lobby. Pretty classy but never seemed real busy. You might be the only ones dancing, or just another couple or two there. Did you want a big area with lots of dancers or a small, intimate situation? I'm pretty sure you can also make song requests at the GF. You could call the hotel and ask for more details, like if they play every night, etc.